1. FCC-hh Machine Detector Interface
Haroon Rafique
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

2. Haroon Rafique - Manchester Accelerator Group Christmas Meeting
LHC
26.67 [km]
1.1 ∙ 1011
2808
1 ∙ 1034
8.3 [T]
350 [MJ]
7 [TeV]
~100 (97.7) [km]
1 ∙ 1011
∙ 1034
16 [T]
8400 [MJ]
50 [TeV]
26.67 [km]
3.5 ∙ 1011
1404
7.55 ∙ 1034
11 [T]
675 [MJ]
7 [TeV]
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

3. (Some of the) Challenges
Civil engineering (major cost)
16 Tesla dipoles (~4500 of them)
Cooling – Liquid He
Beam injection – LHC?
30 [W/m] synchrotron radiation
50 [TeV] (100 [TeV] CoM) proton – proton collisions!
Detectors
Collision debris
Extraction magnets - ~100 kickers (LHC has 15)
Beam dump – how long? (LHC has a 7m carbon dump)
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

4. Haroon Rafique - Manchester Accelerator Group Christmas Meeting
Cross-talk
The FCC-hh Experimental Interaction Region (EIR) is critical in defining FCC-hh performance
Experimental cross talk is a possible issue due to high luminosity and energy proton beams
We use IPA to IPB as a representative case
Questions:
Do protons from collisions reach the next detector?
What effect will this have on operation (background, emittance, losses, etc)?
Do other collision products reach the next detector?
Are there any areas of concern? – if so how do we address them.
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

5. Collision Products (3 [m] post IPA)
Mean protons per primary 1.43
Mean energy of protons GeV
Mean mu- per primary 0.142
Mean energy of mu GeV
Mean charged hadron per primary 23.4
Mean energy of CH 396 GeV
Mean gammas per primary 19.3
Mean energy of gammas GeV
Elastic: E > TeV
Photons
Pions
Protons
Muons
Crossing
Charged hadrons other than protons ignored (for cross-talk) due to rigidity.
Inelastic: E < TeV
Generated using DPMJET-III inside FLUKA Split protons into 2 cases: Elastic and inelastic
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

6. Haroon Rafique - Manchester Accelerator Group Christmas Meeting
Elastic Protons
Tracking performed with PTC and MERLIN Elastic protons all reach IPB with no losses. This will lead to emittance growth. Not a major concern, so we concentrate on inelastic protons
No Crossing
Crossing
IPA
IPA
IPB
IPB
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

7. Power deposited with and without TCLDs
~8 kW in 200 m drift
~1 kW in 45 m drift
790 W in TCLD8
224 W in TCLD10
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

8. Haroon Rafique - Manchester Accelerator Group Christmas Meeting
Muons
Muons can travel far in dense materials. Theoretical calculations estimate a range of ~ 3km.
Theoretical range of muons in standard rock scored at s = 10 m post IPA
S [m]
Muon E at a given s post IPA
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

9. Muon tracking in FLUKA J. L. Abelleira (JAI, Oxford)
Theoretical estimate of range has been confirmed using FLUKA simulations. Muons should not reach the next IP.
109 muon histories scored at given s in FLUKA
Muons generated using DPMJET-III inside FLUKA, with a full detector model, by M. I. Besana
Cross-Talk Studies between FCC-hh Experimental Interaction Regions, IPAC17’, TUPVA036
J. L. Abelleira, A. Seryi, M. I. Besana, R. Appleby, H. Rafique
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

10. Cross-talk summary (including previous work)
50 TeV proton collisions modelled using DPMJET-III in FLUKA
Proton tracking performed with PTC and MERLIN
Elastic protons all reach the next IP with spot size ≈ beam
Inelastic proton cross-talk not of great concern
1 – 10 protons per IPA bunch crossing at IPB FCC-hh v7
Slightly reduced for FCC-hh v8
DS losses mitigated when using existing TCLD design & settings – IPAC TUPIK037
Muon tracking performed with FLUKA
Muons do not have the range to get to the next IP – IPAC TUPVA036
No major incidents due to new lattice from cross-talk perspective
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

11. Machine Induced Background
Major contributors: beam-gas interaction, halo and collision debris losses.
Started a study using FLUKA
Gas density profile required from vacuum team (ongoing)
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

12. Haroon Rafique - Manchester Accelerator Group Christmas Meeting
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

13. Haroon Rafique - Manchester Accelerator Group Christmas Meeting
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting

14. Haroon Rafique - Manchester Accelerator Group Christmas Meeting
13/12/2017
Haroon Rafique - Manchester Accelerator Group Christmas Meeting